Minor: use common implementation of doubleTotalOrderEquals for tests

libraries/stdlib/common/test/testUtils.kt

@@ -21,4 +21,3 @@ public expect fun assertTypeEquals(expected: Any?, actual: Any?)
 public expect fun randomInt(limit: Int): Int
 
 internal expect fun String.removeLeadingPlusOnJava6(): String
-internal expect fun doubleTotalOrderEquals(a: Double?, b: Double?): Boolean

libraries/stdlib/js/test/core/testUtils.kt

@@ -27,4 +27,3 @@ public actual fun randomInt(limit: Int): Int = (kotlin.js.Math.random() * limit)
 
 @Suppress("NOTHING_TO_INLINE")
 internal actual inline fun String.removeLeadingPlusOnJava6(): String = this
-internal actual fun doubleTotalOrderEquals(a: Double?, b: Double?) = a == b || (a != a && b != b)

libraries/stdlib/jvm/test/testUtilsJVM.kt

@@ -33,5 +33,3 @@ private val isJava6 = System.getProperty("java.version").startsWith("1.6.")
 internal actual fun String.removeLeadingPlusOnJava6(): String =
     if (isJava6) removePrefix("+") else this
 
-@kotlin.jvm.JvmVersion
-internal actual fun doubleTotalOrderEquals(a: Double?, b: Double?) = (a as Any?) == b

libraries/stdlib/test/text/StringNumberConversionTest.kt

@@ -150,6 +150,7 @@ class StringNumberConversionTest {
     }
 }
 
+internal fun doubleTotalOrderEquals(a: Double?, b: Double?): Boolean = (a as Any?) == b
 
 internal fun <T : Any> compareConversion(convertOrFail: (String) -> T,
                                         convertOrNull: (String) -> T?,